Biomedical Engineering for Global Health. Lecture 10 HIV/AIDS vaccine development
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1 Biomedical Engineering for Global Health Lecture 10 HIV/AIDS vaccine development
2 Review of lecture 9 How do vaccines work? Types ofvaccines:
3 Review of lecture 9 Are vaccines effective? -Edward Jenner s experiment -Name big success example: How are vaccines tested?
4 Review of lecture 9 What are some challenges of vaccine development? -Developed countries -Developing countries The big three:,,
5 Review of lecture 9 How do vaccines work? Types ofvaccines: Vaccine effectiveness Vaccine Safety: - Non infectious: Inactivated, subunit & toxoid - Live-attenuated - Carrier -DNA -From Edward Jenner to Smallpox erradication -Clinical trials/vaers Challenges of vaccine development -Developed vs. developing world -The big three: TB, Malaria, HIV
6 How do vaccines work? Live attenuated virus Carrier vaccines DNA vaccines Antigen presentation T-helper cell Antigen presentation Non-infectious vaccines Killer T cell B cell: antibodies (neutralize & bridge) By inducing adaptive immunity & memory!
7 Lecture map HIV-1 /AIDS - History of epidemic - The HIV-1 virus - Clinical course of infection The HIV vaccine - History of HIV vaccines - Challenges for vaccine development - Types of vaccines -VaxGen s gp120 -Sanofi Pasteur ALVAC: prime/boost strategy -MerkAd5 Discussion: -Specter article
8 Lecture map HIV-1 /AIDS - History of epidemic - The HIV-1 virus - Clinical course of infection The HIV vaccine - History of HIV vaccines - Challenges for vaccine development - Types of vaccines -VaxGen s gp120 -Sanofi Pasteur ALVAC: prime/boost strategy -MerkAd5 Discussion: -Specter article
9 History of HIV/AIDS NY & CA: Men with symptoms of immunodeficiency Pneumocystis carinii in young gay men HIV isolated (Luc Montaigner/Robert Gallo) CDC: Increased Rx. of pentamidine Syndrome also affected: IV drug users, hemophiliacs, blood transfusion patients & sexual partners of infected people Licensed blood test for HIV antibody detection 100 Cases 1000 Cases 1989: 100,000 Cases TODAY= 1.3 million!
10 The Human Immunodeficiency virus (HIV) Viral components: -nucleic acid core (RNA) -protein capsid -envelope -Glycoproteins
11 The Human Immunodeficiency virus (HIV) NCI/Trudy Nicholson.
12 Clinical course of HIV/AIDS Acute: Infection of CD4+ cells (T-helper cells), 50% of memory cells lost! Loss of defense repertoire! High viral load Symptoms 2-8wks: fever, pharyngitis malaise, weight loss Chronic: Decreased CD4+ cells cannot support rate of replication Innate and adaptive immune responses control expansion Integrated provirus acts as latent virus reservoir: -no viral synthesis - reservoir protected from antivirals and immune attack Mostly asymptomatic: fatigue & lymphoadenopathy AIDS: Progressive loss of CD4+ (T helper) cells = profound defect on cellular immunity increased viral load & opportunistic infections and cancer
13 Clinical course of HIV/AIDS G. Pantaleo et al. Mechanisms of Disease: the Immunopathogenesis of HIV Infection. NEJM. 328 (327 35) Massachusetts Medical Society.
14 Opportunistic infections of AIDS KS Candida albicans Cryptococcus Mycobacterium tuberculosis Herpes Zoster/ Simplex
15 Adults and children estimated to be living with HIV 2007
16 Estimated adults and child deaths from AIDS during 2007 Total 2.1 million
17 The social impact of HIV es/diseases/hiv_aids.html a_zimbabwe0s_aids_orphans/img/1.jpg&imgrefurl= /06/africa_zimbabwe0s_aids_orphans/html/1.stm&h=300&w=416&sz=34&hl=en&start=1&um=1&tbnid= - ACSdzqWD7ReVM:&tbnh=90&tbnw=125&prev=/images%3Fq%3Daids%2Borphans%26svnum%3D10 %26um%3D1%26hl%3Den%26rls%3DRNWE,RNWE: ,RNWE:en%26sa%3DN
18 Lecture map HIV-1 /AIDS - History of epidemic - The HIV-1 virus - Clinical course of infection The HIV vaccine - History of HIV vaccines - Challenges for vaccine development - Types of vaccines - VaxGen s gp120 - Sanofi Pasteur ALVAC: prime/boost strategy -MerkAd5 Discussion: -Specter article
19 History of HIV vaccines 1984: Robert Gallo discovers virus that causes HIV Margaret Heckler, Secretary of HEW, predicts we will have vaccine within 2 years 1997: President Clinton declares, an HIV vaccine will be developed in a decade s time. 2003: President Bush asks congress to appropriate $15B to combat the spread of HIV in Africa and the Caribbean Today: Where is the vaccine?
20 Challenges of HIV vaccine 1. Many forms of HIV HIV-1: Many subtypes: 9 clades HIV-2 Western Africa 2. Each sub-type may require different vaccine 3. HIV mutates rapidly: error-prone reverse transcriptase 4. Surface glycoproteins not readily available for antibodies: Coated in sugary molecules: N-linked glycans Change shape after attachment step 5. HIV infects, suppresses and destroys key cells of the immune system
21 Design Goals for HIV Vaccine Must produce both: Antibody mediated immunity (B cells) Immune system must see virus or viral debris Cell mediated immunity (killer T cells) HIV viral proteins must be presented to immune system on MHC receptors
22 Types of Vaccine Non-infectious vaccines Stimulate B-cells - Killed virus -Subunit - Toxoid Live attenuated vaccines Stimulate both B-cells and killer T-cells Carrier vaccines Stimulate both B-cells and killer T-cells DNA vaccines: Stimulate both B-cells and T-cells
23 Methods tried for HIV vaccine development? VaxGen subunit vaccine (From Robinson H.L., Clin. Pharmacol. Ther. 2007, 82: )
24 Live attenuated viral vaccine Most likely to stimulate necessary immune response Too dangerous! Virus mutates constantly If it undergoes mutation that restores its strength, would be devastating Monkey experiments: All vaccinated animals developed AIDS and died (although more slowly than those infected with unaltered virus)
25 Non infectious vaccines - Whole virus: May not inactivate all virus Animal studies: Stimulates Ab which block a small # of HIV viruses Does not stimulate cell mediated immunity - Viral subunit: envelope glycoprotein : VaxGen Animal studies: Not successful: protection only vs. virus with exact same envelope proteins Phase I/II: Are memory B cells enough to protect vs. HIV? Modest Ab response vs. limited spectrum of HIV strains No cell-mediated immune response Phase III: placebo, 2ble blind trials: Antibodies in 90% of vaccinated people, yet no protection ( : volunteer 2500 IV drug users Thailand, 5000 American gay men at risk for HIV-1)
26 Carrier vaccines Use harmless viral vectors to transport HIV-1 genes into human cells. If booster is needed, different carrier must be used ALVAC : Canarypox virus expressing 3 HIV proteins Prime/boost strategy : Combination ALVAC/ VaxGen Phase I/ II: Safe and immunogenic: Ab, CD4+ & few CD8+ cells Phase III : Thailand study: 16,000 patients, $120 million Merk Ad5 : Adenovirus5 expressing 3 HIV proteins Phase I: Safety and immunogenecity: elicits CD8+ responses Phase II: currently ~3000 volunteers in US and Caribbean Problem: In developing countries ~80% pre-existing immunity to Ad5!
27 DNA vaccines Strategy: Inject large amounts of DNA which codes for viral protein Elicits immune response against that protein Successful in animal trials Generate killer T cell response Can we find a single protein that will elicit immune response against many HIV strains? Currently in Phase I : Oxford-Nairobi Prostitute Vaccine (Prime/boost: naked DNA - modified vaccinia Ankara virus as HIV gene carrier)
28 HIV trials in progress: 2006 (From Rerks-Ngarm et al. ;AIDS, 2006, 20: )
29 HIV trials in progress: 2007 (From Robinson H.L., Clin. Pharmacol. Ther. 2007, 82: )
30 Dangers of Vaccine Trials Most researchers feel first HIV vaccines will not be more than 40-50% effective Will vaccinated individuals engage in higher risk behaviors? Vaccine could cause as much harm as it prevents Future vaccines cannot be tested against placebo, would be unethical
31 Summary of lecture 10 The HIV-1 virus - Life cycle - Clinical course of disease: acute, chronic,aids The HIV vaccine -5 challenges for vaccine development -Possible vaccine alternatives -Current HIV vaccines in advanced clinical trials: VaxGen, ALVAC, AD5 -Dangers of vaccine trials
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